forked from openjdk/jdk
/
FileDispatcher.java
73 lines (58 loc) · 2.87 KB
/
FileDispatcher.java
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/*
* Copyright (c) 2007, 2021, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.nio.ch;
import java.io.FileDescriptor;
import java.io.IOException;
import java.nio.channels.SelectableChannel;
abstract class FileDispatcher extends NativeDispatcher {
public static final int NO_LOCK = -1; // Failed to lock
public static final int LOCKED = 0; // Obtained requested lock
public static final int RET_EX_LOCK = 1; // Obtained exclusive lock
public static final int INTERRUPTED = 2; // Request interrupted
/**
* Sets or reports this file's position
* If offset is -1, the current position is returned
* otherwise the position is set to offset.
*/
abstract long seek(FileDescriptor fd, long offset) throws IOException;
abstract int force(FileDescriptor fd, boolean metaData) throws IOException;
abstract int truncate(FileDescriptor fd, long size) throws IOException;
abstract long size(FileDescriptor fd) throws IOException;
abstract int lock(FileDescriptor fd, boolean blocking, long pos, long size,
boolean shared) throws IOException;
abstract void release(FileDescriptor fd, long pos, long size)
throws IOException;
/**
* Returns a dup of fd if a file descriptor is required for
* memory-mapping operations, otherwise returns an invalid
* FileDescriptor (meaning a newly allocated FileDescriptor)
*/
abstract FileDescriptor duplicateForMapping(FileDescriptor fd)
throws IOException;
abstract boolean canTransferToDirectly(SelectableChannel sc);
abstract boolean transferToDirectlyNeedsPositionLock();
abstract boolean canTransferToFromOverlappedMap();
abstract int setDirectIO(FileDescriptor fd, String path);
}